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(No Model.) 'v J. B.`WINN LIFTINGJAQK. y H

No. 367,881.- Patented Aug. 9, I1887.

' f www@ mm1 Q @l Il l l MMM WITJVESSES l UNITED STATES PnrinvrI OFFICE.

JOHN B. VINN, OF WATERTOWN, DAKOTA TERRITORY.

SPECIFICATION' forming `pari; of Letters Patent No. 367,881, dated August 9, 1887. Application tiled February 5, 1887. Serial No. 296,685. (No model.)

To all whom, it may concern:

Be it known that I, JOHN B. WINN, a citizen of the United States of America, residing at Watertown, in the county of Codington and Territory of Dakota, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification, reference being had` therein to the accompanying drawings.

This invention relates to improvements in lifting-j ac'ks'; and it consists in the construction and arrangement of the parts, whereby heavy bodies can be raised with ease and rapidity, they can be automatically retained in a raised position, they can be lowered after being so vraised without loss of time, and certainty and rapidity of action and lightness and simplicityV port the strain upon the lever side of the n1a chine.

Upon the base A, directly under the center of the head-plate C, is fixed the guide E. The said gnideis arhollow cylinder extending from said baseupward through the bracing-plate D, and is held firmly in position by the same.

Surrounded by the said guide E is the rod F.'

The said rod extends from the base A, when resting upon the same, to above the head-plate y C, whiehhas a perforationin the center to accolnmodateit. The said rod is provided with a head, F, upon which the body being raised rests. Surrounding the said rod F are two collars, G and H, which are somewhat larger in diameter than the said rod, to allow of free passage for the said rod when the said collars are in a horizontal position. The collar H is provided at a point upon its periphery with a depending lug, H', which, when the` said collar rests uponfthe lplate C, tilts the same, as

This tilting ofshown at Fig. l of drawings. the collar causes the opposite sides of the perperforated to receivea bolt.

foration in the said collar toimpinge upon the said rod F. The collar G rests upon the top of the guide E, and is provided upon the side with a perforated lngVG. It is held in position upon the guide E by means of the coil,- spring I, which surrounds the said rod F and bears against the said collar G and head- Vplate C.

The head-plate Gis provided with the slotted bracket C', the ends ofthe wings of which are Fitting between the wings of the said` bracket, and provided With a corresponding perforation opposite the perforations in the said wings, is a lever, K. The said lever is suspended in the said bracket by a bolt, which is passed through the perforations in the ends of the bracket and in the lever. The lever K is provided with 'a perforation at the'lifting end for the reception'of the link L, which connects the said lever with the perforated lng G of the collar G. i

The parts used in this machine are as light as it is possible to make them. The standards B and B are hollowed so as to resist any vertical strain, and at the same time lighten the construction. They are also so disposed as to distribute the weight upon them all equally. In the operation the machine is so placed under the object to be raised that the rod F will be in the line of resistance, and with the head F resting against the said object. The outer end of the lever K is then depressed, raising the inner end. At the beginning of the upward movement of the inner end of said lever the collar G is tilted until it takes a hold upon the rod F. During the remainder of the 'stroke the rod F and the object resting upon the head F are raised. As the rod F passes upward, the collar H is raised to a horizontal position and allows the said rod to pass. When the motion ceases, the said collar is immediately tilted by the depending lug Hand takes a frictional hold upon the vsaid rod F. When the lever is at the end of the stroke, the outer end is raised and the inner end depressed, -releasing the hold of the collar G upon the rod F. When the hold is thus released, the spring I, which in the upward movement has been contracted, forces the collar G down upon the top of the guide E. During this operation the rod F is held in its last raised position by ieetion II.

ject without, loss of time, the depending ing` H is forced around nnluil it over the slot (Il in the headplnte (l, when the eollm- .TI wiil drop to :i horizenlnl position nud :illouv the rod F to pass.

lVhat I claim is- In a liftingjnek Such :is described, the com` binnbion of nJ lifting-red ndnpted lo nieve up and down7 n guide for Suid rod, Suid guide resting upon and perpendicular' to the brise oi' the machine nud braced to the standards of' 111e saine near Lhe top of said guide, n [mine for said lnnehine provided with n hend-plnte, Substantially as deserihed, two eollnrs sur- .i'oimdiner und having' n Soinewhnt larger dimnei er lhnu ihennid li {ting-rod, whereby when the said Collars ure inclined lo the said rod Lhey impinge upon the opposite sides thereof, Substantially ne described, the one of said cellars provided with n projection upon ite lower mee adapted to rest upon said headplate of the frame und tilt the snid collar, and the other of said collars provided with n, perh fomlzed lng :it one point of the periphery, :ind suiinhlenieehmiism forlifbing attached thereto, and :i springr Surroulnlinjs,` the ssi/id lifting-rmlv find having :i hearing :igninsb the Said insb eollnr und the Suid hend-plnte, substnuini:illyneY Sei, forth.

In testimony whereofl nf'iix my signature in presence el" two witnesses.

JOTTN B. WINN.

Wiineeses;

W. S. (lewe. F. .T. 'Nnnfnnsox 

